Modern forensics can tell investigators a lot about a crime scene. DNA testing, blood spatter analysis, footwear impressions and ballistics can all help an investigator determine what happened and who might be responsible for a crime. Add glass examination to the list of tools available to a forensic examiner.

Forensic glass examination? As it turns out, broken glass can reveal a lot. While glass might not identify whodunit (unless the guilty party left fingerprints behind), the way a glass breaks can reveal a lot about how the break occurred, and what might have (or must have) happened at the time the glass broke.

For example, the way broken glass lands can reveal the direction from which the breaking force came. Stress fractures that eventually break a piece of glass can help investigators determine the height at which a bullet or other projectile was fired, the force needed to break the glass, and the direction from which the projectile came. This information can support other findings at a crime scene.

Further, glass can be examined and compared microscopically. That’s helpful because small fragments of glass can be transferred from a scene to a victim, or to the perpetrator. Being able to prove that a small sliver of glass connects a person to a crime scene can be exceptionally valuable. Typically, glass is produced regionally, so glass from different regions has different characteristics. Forensic examination can reveal the region from which the glass originated. That can also be helpful in placing a perpetrator or victim in the presence of glass that may have a unique composition.

Like other forensic techniques, forensic glass examination has become more sophisticated, and is increasingly being used to confirm other findings at crime scenes.

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